The location of <aiin> and <ain> groups

[nickpelling]

It's a good observation to be starting from. The implication is that at least some of the single characters before aiin at the start of a line are in some way nulls.

For me, the interesting question is whether the proportion of saiin to (non-s)aiin at the line start is the same as the proportion of aiin to (single-letter)aiin. If it is , it would give support to the suggestion that line-initial s- is a null.